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    从以下学员名单中随机选出4个学员

	var arr = ["鹿晗","王俊凯","蔡徐坤","彭于晏","周杰伦","刘德华","赵本山"]

	注意：不要有重复的学员

    
</body>
<script>
    var arr = ["鹿晗","王俊凯","蔡徐坤","彭于晏","周杰伦","刘德华","赵本山"]
    var newarr = []
    function getRandom(min, max) {
        return Math.floor(Math.random() * (max - min + 1)) + min;
    }
    while(true){
        var temp=arr[getRandom(0,6)]
        if (newarr.indexOf(temp)==-1){
            newarr.push(temp)
        }
        if(newarr.length==4){
            break
        }
    }
    console.log(newarr);
</script>
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